Malicious PDF — malware analysis report

Static analysis result for SHA-256 e25dad3df139be82…

MALICIOUS

PDF

88.8 KB Created: 2021-09-06 09:26:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8e9c97dc8df5e205eff2d2ac961a8339 SHA-1: 5b4207c9dbce985582afdbc41c911a85fa53a579 SHA-256: e25dad3df139be8240f11706984cfc7d3e4cd437e4efee2a0e5723c5d3946b30
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting, which are commonly used for phishing or distributing further malware. The presence of multiple external URIs and link farm heuristics strongly suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://walkofagesvt.org/clients/0/0e/0e42319052772b195a43ba3ede0f03e0/File/40857596976.pdf In PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16079a78c139f3---31519228111.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/6882260b46f3e2295e65f3164a99de8a/jovurebinegowi.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/63728930389.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/72872803178.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/31137842224.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160818a39565a9---posiludur.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/lixalil.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc9d99dc1a---82349155095.pdfIn PDF document text
    • http://dancephoto.ru/userfiles/files/jodedisuworeva.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/o60tbdr272i8sn70a3ta506dqn/monevivofosudolo.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/a0b4e01b8d1240dcc4a9e4250d990a57/4132330093.pdfIn PDF document text
    • https://xosobacninh.vn/webroot/img/files/kerunur.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/cafe38a42a1b52c4002944730989bd3d/wegoliporadosuriz.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610f6bb052b8a---luxezusovopigif.pdfIn PDF document text
    • http://npi-management.org/ressource/site-image/files/89285245387.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2b9629dbc---72226905653.pdfIn PDF document text
    • http://beerskiboot.de/img/upload/file/61363860114.pdfIn PDF document text
    • http://vlajamo.cz/images/file/nabosijudukizetejuvifizog.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210707134246.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/f96278a7868b72f967b9afb19a7768d8/39720844222.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/kekenorit.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084023f32370---xejafuruwekobufakef.pdfIn PDF document text
    • http://ingpoggi.eu/userfiles/files/piparorezulopumimuf.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160f87ee27670b---gekawukuta.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/8674797614.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=autodesk+inventor+2020+manual+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010af8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF8 18552 bytes
SHA-256: f5cf8927b6dc3ba7b5e5daf25e9008b9852bb432e0dc77d2fc5a7c4bbe50fbbe
font_02_sfnt_off00013b1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B1F 11140 bytes
SHA-256: 858709b235bd2ab24ffbcafc9f05145b9f636d1ec08772e1b32bf77d42d8c166

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